Lius tiers and alexander h



(No Model.)

J. H. PENDLETON.

MEANS FOR RELIEVING DISCHARGE VALVES 0F DOUBLE ACTING PUMPS. No.373,478. Patented Nov. 22, 1887.

' u PErcns. Pitch-Lithographer, Washington. 17. a

NITED STATES JOHN H. PENDLETON, OF BROOKLYN, ASSIGNOR TO HIMSELF, ANDOORNE LIUS TIERS AND ALEXANDER H. TIERS, BOTH OF NEW YORK, N. Y.

MEANS FOR RELIEVING DISCHARGE-VALVES 0F DOUBLE-ACTING PUMPS.

SPECIFICATION forming part of Letters Patent No. 373,478, dated November22, 1887.

Application filed December 15, 1585.

To aZZ whom, it may concern:

Be it known that I, John H. PENDLETON, of Brooklyn, in the county ofKings and State ofNew York, have invented a new and useful Improvementin Means for Relieving Discharge-Valves of Double-Acting Pumps, of whichthe following is a specification.

Myinvention relates to the discharge-valves of pumps which severallyhave a larger area exposed to pressure on the back than on the face, andwhich have connected with them diaphragms or pistons fitting smallcylinders or chambers, and exposed on one side to the full pressure ofliquid in the pump, and upon the other side provided with vents, wherebythey are relieved of pressure. In the operation of a pumpprovided withsuch adischargevalve the liquid under pressure from the pumppiston actsupon both the face of the valve and upon the piston of diaphragm whichis connected with the valve, and the combined pressure upon the face ofthe valve and upon the piston or diaphragm is amply suificient toovercome the pressure of the water-column upon the back of the valve. Inmy application for. United States Letters Patent, Serial No. 185,696,filed ofeven date herewith, I have shown and described a combination inwhich the vent-pipe leading from the piston or diaphragm chambercommunicates with the atmosphere, or, in other words, with a vesselwhich is open to atmospheric pressure, and from this vessel anywaterwhich may pass the piston or diaphragm as leakage is returnedautomatically to the suctionchest or supply of the pump to be againpassed through the pump. WVhen the dischargevalves of doubleacting pumpshave connected with them pistons or diaphragms for aiding their opening,as described, the vent-pipe from the piston or diaphragm chamber whichis in one waterchamber of the pump may be connected direct-ly with theother chamber of the pump, and then the reciprocating movements of thepiston will serve not only to produce pressure alternately upon thepistons or diaphragms which are connected with the valves, but will alsoalternately produce a suction through the vent-pipes upon the oppositeside of such pistons or diaphragms; and this combination ofdischarge-valves and motor pistons or dia- Scrlal No. 185,695. (Nomodel.)

phragms with the water-chambers of a doubleacting pump wherein pressureis alternately produced by the reciprocating movements of the pistonforms the subject-matter of my present invention.

The accompanying drawing represents a longitudinal vertical section ofthe liquid cylinder, chambers, and valves ofa double-acting pumpembodying my invention.

Adesignates the cylinder, andB the piston, by the movement of which theliquid in the opposite chambers O O is alternately put under pressuresufficiently to open the discharge valves b, whereby the chambers O Ocommunicate with the discharge-chest E. The chambers G C alsocommunicate by valves a with a suction-chest, D. The suction-valvcs amay be ofany suitable construction, and my invention in no way relatesto them.

As here represented, the dischargevalves b are closed upon removableseats d,and,as usual in pump-valves of this class, the area exposed topressure on the back or top of the valve is greater than that exposed topressure on the face of the valve, by reason of the lapping which thevalve necessarily has on its seat and around the openings therein. Inorder to balance the discharge-valves b and aid them in opening, Iarrange in the two chambers G G motors, which are connected one witheach valve, and are operated by the pressure of water alternatelyproduced in the chambers O 0'. As here represented, each motor consistsofa movable diaphragm or piston, 6, connected by a stem, 6, with avalve,I), and working freely within a small cylinder or chamber, f. On the oneside of the diaphragm or pis ton e the chamber f is entirely open, sothat the diaphragm or piston on that side is exposed to pressure whichmay be created in the chamber 0 or O, and on the opposite side of thediaphragm or piston a vent-pipe, 9, leads from each chamber orcylinderfto the other water-chamber O or O. The vent'pipe g from themotor which is in the chamber 0 leads to the chamber 0, and thevent-pipe g from the motor which is in the chamber 0 leads to thechamber 0.

The cylinder f on that side ofthe diaphragm or piston which is vented,and which in this instance is the upper end, is closed by a cap pressurein the chamber 0, and will produce a vacuum or remove any pressure whichmay be in the chamber 0. The pressure acting upon the face of thediaphragm or piston e of the motor which is in the chamber 0 at the sametime that its opposite side is relieved of pressure by the vent-pipe 9,leading to the chamber 0, will be sufficient to equal or slightly exceedthe difference in pressure exerted on the back and face of the valve 12,and consequently the valve 1) will be opened by a pressure no greaterthan that necessary to force the liquid after the valve is opened.

I have shown springs sapplied to the pistons e for quickening theclosing of the valves b.

i From the above description it will be understood that when the pistonBis moving toward the left, as indicated by the arrows, not only willthe water in the chamber 0 exert a pressure upon the face of the pistone in that chamber to open the corresponding valve,b, but such pressurewill be communicated from the chamber, through the vent-pipe g, to theback .of the piston e, which is in the chamber 0, and will thereby tendto hold the valve 1) corresponding to that piston tightly to its seat.

This same movement of the piston B will produce a suction in the chamberG, and such suction will be communicated through the vent-pipe leadingfrom the chamber 0 to the piston-cylinder f, which is in the chamber G,and hence the piston e, which is in thechan1- her 0, will not only bemoved by the pressure in the chamber 0, but such movement will be aidedby the suction in the chamber O,which is communicated through thevent-pipe g.

I do not claim herein the combination, with a pump-piston, a chamberwherein the fluid is put under pressure by the movement of the piston,and a discharge-chest, of the valve b in the discharge-chest, forcontrolling the discharge from said chamber, and having a stem,

e, projecting inward through the valve-seat,

a diaphragm, e, directly connected with the inner end of the stem, thesupplemental cham ber f, containing-the diaphragm, opening at one enddirectly into the chamber, wherein fluid is put under pressure by themovement of the piston and at its oppositeend closed and provided with avent, and a sleeve extending inward from the valve-seat and connectingthe closed end or top of the chamber f with the valve-seat, as such acombination of parts is claimed in my pending application, Serial No.185,696, filed December 15, 1885.

What I claim as my invention, and desire to secure by Letters Patent,is-

The combination, with the two water-chambers, of a double-acting pumpwherein pressure is alternately produced by the reciprocating movementof the piston, and with the discharge-valves leading therefrom, ofdiaphragms connected with the valves, supplemental chambers f, arrangedin the two Waterchambersand containing the diaphragms, and

' receiving on one side.ot' the diaphragms the full pressureofliquid,a-nd a vent-pipe, whereby the supplemental chamber of thediaphragm in each water-chamber is connected with the other waterchamber, substantially as herein described.

J. H. PEN DLETON.

Witnesses:

, FREDK. HAYNES,

HENRY MCBRIDE.

